Made a little test render in P13 one with Superfly and one with LUX

Superfly version in P13

And This is the LUX engine in P13

Both using GPU Render time was about 6min Superfly and 4 min LUX. Quality is approx. the same probably depends on setting and lights these are just simple setups. You naturally get allot more features in LUX but this is quiet a learning curve.